LAN91C93I-MU - 10 Mbps Ethernet Controller | Microchip | TQFP-100
料号： LAN91C93I-MU ✓ 量产中LAN91C93I-MU 概述
An Ethernet controller is an interface integrated circuit that manages frame transmission, reception, buffering, addressing, and host communication for an Ethernet network. The LAN91C93I belongs to the local-bus controller hierarchy, combining an Ethernet MAC, protocol handling, and PHY-interface logic into one device. Its IEEE 802.3 and 10BASE-T support connect it to the Ethernet physical-layer ecosystem, while full-duplex switched Ethernet capability allows transmit and receive traffic to proceed independently. This integration places the LAN91C93I between a host processor and an Ethernet transceiver, simplifying the hardware architecture compared with a solution using a discrete network controller and additional interface glue.
Key device characteristics include 10 Mbps Ethernet operation, a 10BASE-T PHY interface, full-duplex switched Ethernet support, independent transmit and receive operations, and an enhanced transmit queue. The controller's local-bus mode software compatibility with the LAN91C92, LAN91C94, and LAN91C96 can simplify firmware migration when an existing product family already uses those controllers. Its non-PCI architecture also provides an important alternative for embedded systems whose processors do not expose a conventional PCI bus. The 100-TQFP package provides enough pins for the parallel host interface, control signals, memory connections, and Ethernet-related signals, but it also requires careful escape routing and multilayer-board planning. The specified -40°C to +85°C operating range suits industrial equipment where commercial-temperature components would be insufficient.
Technically, the LAN91C93I combines local-area-network controller functions with an enhanced transmit queue and fully independent receive and transmit operations. The enhanced queue allows the software driver to stage packets more effectively, which is valuable in systems where network traffic must be transferred between an external processor and the Ethernet medium without blocking host execution. The PHY interface follows 10BASE-T requirements rather than 100BASE-TX, determining the external magnetics, connector, line-driver, and cable requirements of the board. Local-bus software compatibility with four related controller families reduces the amount of low-level networking code that must be rewritten, although drivers should still be checked for register, interrupt, and device-option differences. The device is manufactured in CMOS technology and is specified as a green package, supporting lead-free assembly processes where its production documentation confirms the appropriate soldering profile.
Typical applications include industrial control terminals, embedded instrumentation, legacy network gateways, factory-floor controllers, and compact embedded networking modules. In each case, the controller provides a conventional Ethernet interface to a host processor while managing frames, transmit queuing, and receive activity in hardware. A 10BASE-T-only design is appropriate for legacy infrastructure, isolated point-to-point links, or equipment where 10 Mbps is sufficient and component cost matters. It may also serve as a migration interface when an established product already contains LAN91C92-, LAN91C94-, or LAN91C96-compatible software. Modern high-bandwidth gateways generally require a faster Ethernet controller, but the LAN91C93I remains useful where software continuity and local-bus integration outweigh throughput.
The primary PCB design consideration is the parallel host-bus and memory-interface routing required by a 100-pin TQFP. Place decoupling capacitors close to each applicable supply pin, maintain short high-speed Ethernet paths between the controller, external PHY components, magnetics, and RJ45 connector, and provide solid ground-plane continuity under the device. Keep analog and digital return currents separated where the board stackup permits, and follow the manufacturer's recommended pinout and reference circuitry. Verify the external network interface against the 10BASE-T design requirements rather than assuming that a 100BASE-T magnetics assembly is interchangeable.
This page combines manufacturer and distributor product facts with package, application, purchasing, and replacement guidance to support early design decisions. It distinguishes verified electrical and package characteristics from parameters that require confirmation in the complete manufacturer datasheet, helping engineers qualify the LAN91C93I-MU for embedded Ethernet designs before committing to a PCB layout or production release.
直接替换替代料： LAN91C93I-MU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LAN91C93I-MU （相同外形与封装尺寸） ——差异在于 Package Type, Supply Voltage.
LAN91C93I-ME
✅ 直接替换联系询价
查看数据手册 →LAN91C93I-MS
✅ 直接替换联系询价
查看数据手册 →LAN91C93I-MU 规格参数
| Device Type | Non-PCI single-chip full-duplex Ethernet controller |
| Ethernet Data Rate | 10 Mbps |
| IEEE Standard | IEEE 802.3 |
| PHY Interface | 10BASE-T |
| Technology | CMOS |
| 电源电压 | 3.3 V |
| Compatible Supply Voltage | 3.3 V and 5 V |
| 工作温度 | -40°C to +85°C |
| Package Type | 100-TQFP (14 x 14 mm), green |
| Total Pin Count | 100 pins |
| 安装类型 | Surface Mount |
| Duplex Operation | Full Duplex |
| Network Support | Switched Ethernet |
| Transmit Architecture | Independent transmit operation with enhanced transmit queue |
| Receive Architecture | Independent receive operation |
| Local-Bus Software Compatibility | LAN91C92, LAN91C94, and LAN91C96 |
| Host Interface | Non-PCI local bus |
| Packaging | Tray |
| RoHS 状态 | RoHS3 Compliant |
LAN91C93I-MU 100-tqfp (14 x 14 mm), green 引脚配置指南
LAN91C93I-MU（100-tqfp (14 x 14 mm), green 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： LAN91C93I-MU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LAN91C93I-MU 适用于 6 应用s: Industrial Control Terminals, Factory Instrumentation, Legacy Network Gateways, Embedded Network Modules, Point-to-Point Equipment Links, Legacy Product Family Migration.
Industrial Control Terminals
The LAN91C93I-MU fits industrial control terminals that require a conventional local-bus Ethernet interface at 10 Mbps. Its IEEE 802.3 support, 10BASE-T PHY interface, and full-duplex switched Ethernet operation allow a host processor to connect to plant equipment without using a PCI bus. The -40°C to +85°C rating supports industrial-temperature deployments, while the enhanced transmit queue improves handling of queued traffic. The design must still include qualified Ethernet isolation, surge protection, grounding, and a 10BASE-T-compatible physical layer.
推荐
Factory Instrumentation
LAN91C93I-MU is appropriate for factory instrumentation requiring legacy Ethernet connectivity, status reporting, and remote control over a local bus. Its independent transmit and receive operations support full-duplex switched Ethernet, while compatibility with LAN91C92, LAN91C94, and LAN91C96 local-bus software can simplify migration within an established instrument family. At 10 Mbps, the controller is best suited to supervisory and control traffic rather than continuous high-rate data acquisition. Use the manufacturer reference circuitry and validate isolation, grounding, and environmental requirements.
推荐
Legacy Network Gateways
The LAN91C93I-MU can provide a 10BASE-T network port for a gateway connecting a legacy local-bus device to an Ethernet network. Its non-PCI architecture works well with embedded processors that expose a parallel host interface rather than a conventional peripheral bus. The enhanced transmit queue helps manage packets moving between the host and Ethernet medium, while the full-duplex architecture permits simultaneous traffic. The 10 Mbps limit should be checked against the gateway's expected throughput, and the external magnetics and connector must support 10BASE-T.
推荐
Embedded Network Modules
LAN91C93I-MU is useful in compact embedded modules that require an Ethernet MAC and local-bus controller integration on a single IC. The 100-TQFP package provides dedicated connections for the host interface and Ethernet functions, reducing the component count associated with a more fragmented networking design. Because the device is a 10 Mbps 10BASE-T controller, modules intended for modern gigabit networks will need a different Ethernet architecture. Confirm pin assignment, clocking, memory connections, and thermal performance using the complete manufacturer documentation.
推荐
Point-to-Point Equipment Links
The LAN91C93I-MU can serve isolated 10BASE-T point-to-point links between industrial equipment and a local controller. IEEE 802.3 operation, full-duplex switched Ethernet, and independent transmit and receive paths provide a conventional network interface without PCI hardware. This configuration is practical when cable length, isolation, and link performance are governed by 10BASE-T requirements rather than modern high-speed Ethernet. Use an external 10BASE-T physical layer with suitable magnetic isolation, protect the line interface against surge events, and preserve controlled ground separation where required.
推荐
Legacy Product Family Migration
The LAN91C93I-MU supports migration of products built around the LAN91C92, LAN91C94, or LAN91C96 local-bus controllers because the manufacturer specifies local-bus software compatibility. This can reduce firmware redevelopment when an existing platform needs a different controller ordering code or supply path. Compatibility should be validated at the register, interrupt, initialization, and driver levels rather than assumed from the family relationship. The 100-TQFP footprint also allows board-level reuse only when the footprint, pin functions, and device options are confirmed unchanged.
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推荐产品汇总
工程参考数据： LAN91C93I-MU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LAN91C93I-ME | LAN91C93I-MS |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-TQFP (14 x 14 mm) | 100-TQFP - same package | 100-TQFP - same package |
| Pin Count | 100 pins | 100 pins | 100 pins |
| Device Type | Non-PCI single-chip Ethernet controller | Ethernet controller | Ethernet controller |
| Ethernet Data Rate | 10 Mbps | 10 Mbps | 10 Mbps |
| IEEE Standard | IEEE 802.3 | IEEE 802.3 | IEEE 802.3 |
| Supply Voltage | 3.3 V; 3.3 V and 5 V compatibility listed | 3.3 V and 5 V listed | 3.3 V and 5 V listed |
| Host Interface | Non-PCI local bus | Local-bus Ethernet controller | Local-bus Ethernet controller |
关键差异点
- Integrated non-PCI Ethernet controller architecture （对比 LAN91C93I-ME)
- Documented local-bus software compatibility （对比 LAN91C93I-MS)
- Industrial-temperature operation （对比 LAN91C93I-ME)
设计说明
Route the parallel local-bus interface on a multilayer PCB with short, matched paths where timing permits. A 100-pin TQFP requires careful fan-out, decoupling placement, and uninterrupted ground-plane continuity beneath the device. Keep the Ethernet line-side section physically separated from sensitive host logic and place external 10BASE-T interface components near the connector and isolation devices.
Decouple each applicable 3.3 V supply connection directly at the package pins and follow the manufacturer reference circuit for capacitance and placement. Confirm that every rail remains within its specified operating range during processor startup and Ethernet activity. If the surrounding system also uses 5 V, distinguish interface-domain voltage levels from core supply requirements instead of assuming the controller accepts either rail interchangeably.
Use a 10BASE-T-compatible external physical interface, magnetics, and connector arrangement. Preserve the manufacturer-recommended line and termination topology, maintain the required isolation boundary, and avoid routing Ethernet signals across plane splits. Validate the complete interface for return loss, insertion loss, common-mode behavior, and surge exposure rather than testing only controller-side signals.
Do not treat software compatibility with LAN91C92, LAN91C94, and LAN91C96 as proof that every suffix is an automatic drop-in replacement. Confirm pin functions, initialization registers, interrupt behavior, timing, temperature grade, and qualification for the exact ordering code. Also verify that existing board layouts use the 100-pin TQFP footprint rather than a mechanically similar but electrically different package.
合规信息
A distributor specification identifies the device as RoHS3 Compliant and describes the package as green. Other environmental, material, and qualification declarations are not stated.
